Guard



Sept. 27, 1932. w JESSQP 1,879,283

GUARD 7 Filed April 23, 1930 7 Sheets-Sheet 1 v@NT6/Z Sept. 27, 1932. w JESSOP 1,879,283

GUARD Filed April 23. 1930 7 Sheets-Sheet 2 Sept. 27, 1932. w JESSOP 1,879,283

GUARD (I Filed April 23. 1930 Sheets-Sheet 3 Sept. 27, 1932. w. JEssoP- 1,879,283

GUARD Filed April 23, 1950 7-Sheets-Sheet 4 Fig.4,

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GUARD Filed April 23. 1930 7 Sheets-Sheet 5 Fig.6).

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GUARD Filed April 23, 1930 7 Sheets-Sheet a [NVBNTG IL Sept. 27, 1932. JESSOP v 1,879,283

GUARD Filed April 25, 1950 7 Shets-Sheet 7 Fig.7.

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Patented Sept; 27, 1932 Y-YUNITVEZD STATES PAT WILLIAM mssor, or snails, ENGLAND, ASSIGNOR or ONE-THIRD ronnuus, "LIMITED,

AND ONE-THIRD rowan INTERNATIONALPAINT AND comrosrrrons company, i

LIMITED, BOTH or Lennon, ENGLAND GUARD Application med A- ru 23,,19a0,;seria1 No. 446349, rand in Great Britain April 30, 1929.

, This invention relates to guardsi'for presses and particularly power presses, stamps, hammers and the like machines of the type in which the guard member isadapted to move .5 outward towards the operative engaged in feeding the machineiso that in the event of the operative not removing his hands at'the appropriate timefrom the danger zone the guard member will operate to force them Inguards-of this kind theguard member hashitherto been arranged to be operated by some moving partof the machine and in such manner that the same degree of motion'is im- {:1 parted 'to' it whether or'not an obstruction,

for instance-the hands of the-operative, is in the path of its motion, with-theresult that the I guard member if associated with ajquick acting machine is subjected to considerable L2?! stresses,

According to thepresent inventionaguard member of the kind in question is associated with means adapted to, constrain it toimove, in setting. the pressor -the-like in motion,

12') into -.a--normal.-safe positioninwhich it will preclude *the hands of the operativerentering the danger zone, and means "adapted by the operation of the press,- in theqevent :of the guard member being restrained from assuming the said position to movetheguard "member outward andremove the obstruction. Inone constructlon'in accordancezwlththe invention the pedal'by which the press or like machine is set in motion is connected by i and the guard member normally ,infengagement to cause the guard member to force any obstructionv to its motion; away fromthe danger zone ofthe machine,-the said driving tion,

construction in accordance with and 5, while v I "bers 8 connected together by bars '9; adapted" engaged and a driving connection -is providedbetween some moving'part of the press connection =;being interrupted only the rofqthe pedal;

"The invention Will be described further in detail and by Way of example'withreierence to the accompanying drawingsin Which:-

Figure l is a frontelevation-of'one construction showing the guardinthe open posi- Figure 2 is a side elevation thereof, and Figure 3 is .a 'furtheroside elevation. v :Figure 4 is a side elevation? of .a further the. invention, i I Figure 5 ,is a frontelevation of the contstruction' illustratedlin Figure 513' v Figure :6 illustrates the normal operation of the construction illustrated in Figures ,Figure 7 illustrates :the operation thereof when opposition to its operation is encountered. Y p I.

In the constructions illustrated,..the guard. member comprises a'mainframe,a shaft 1 pivotally secured through thebracket-lugs 2 to the body of the press 3 -.and'.incl uding i .side members 4 extending in a downward direction from the "shaft and connected by bars5; r

Adjacent to their lower extremities andin the vicinity-of 'thegap 6 'o'f'the press to et-he main frame is pivotally connectedby the bar-7 a second frame comprising side "memwhen-the sidegmembers of thetvvo frames are i substantially in-register, to preclude access to the gap ofthe press. In theconstruction 'il-' lustrated in Figure 3,'to'th'e secondframe is connected aleverIQpivotally connected with r a rod ll'havingiat its upper extremityla connection "12 adaptedtopermit acertaini degree of lost motion'between the rod' ll and the lever'l3. The lever 13 'is c'ormed vv'ith a recess ing device 36 of the press.

19, mouuted on pivot 29 about which it is adapted to rock in opposition to the spring '21. Also mounted on the pivot is the cam lever 22 connected with the rod 23 the forward end 24 of which bears against the;

first mentioned guard frame, the cam lever being caused to move about its pivotal connection with the body ofthe press by the action of the peda lever 25, pivoted at 26 constrained against the spring 27 an d connected at QSwit-h the rod 29oonnected to the lever 30 provided with a roller 31 bearing against the cam lever and-pivoted at 32 with'the lever19, andat 33 with the rod 34- con'nected through the lost motion connectiou 35 with the clutch actuat- In operating the press the pedal lever 25 is depressed, and the main guard frame (see dotted position in Figure 2) is pushedoutward to a'degree which will constrain the seeone guard frame to pos1t1on.,

Should the guardmember be permi move into the safe ted to V assume the F safe posit-ionthe motion of the rod 11 connecting the second frame with the [lever 13 will release the recess 14 in t I I I u from engagement with the eccentric pin 10, {and continue depression of the pedallever to cause the clutch of the press to beengaged will not result in further motion being mhe lever parted to the guard member.

1* If, on the other hand, an obstruction prevents the second ,frame 'from assuming the normal safe posit-ion, the recess 14: in the lever 13 will'not bereleased from engagement with the eccentric pin 15, and-both the main guard frame and the second guard frame will be caused to move outward consequent on the zm'oticn of the eccentric pin 15 to the extreme right hand position shown dotted in Figure 3 and the secondframewill be causedto move outward while the roller 31 bearing upon the cam. lever 22 associated with the second frame will constrain it to grip the hand or other obstruction to its: motiouunder the f action. of the spring 21.

In the constructionillustrated in igures 5,6 and 7, the second frame is pivotally 0on D tected at 37 with the lever 38 to the upper portion of'which is pivotally connected at 39 one end of-a link 40, the other end of which is pivotally' connected at with the main frame 4.

ns7aes3 Also pivotally connected at 39 with the lever 38 is one end of the link l2provided adjacent to its other end with a lot 43 adapted to engage a pin l4: in the lever 45 coaxially mounted on the shaft 1 with the main frame.

The lever 45 is provided with a cam faced projection 46 adapted to engage and be disengaged from contact with the end 47 of the lever 38 and is pivotally connected by means of the clamp 18 with a push rod 49 engaging at its end 50 the pin 51" eccentric-ally mounted on theoperating shaft 16. i In' theoperationof the guard the main frame is constrained to move against the action of the spring 52 connected at 53 with a stationary part of the machine and at 54 withthe main frame.

For regulating the position of the main frame 'with respect ,to the body of the press,

c an adjustable stop is provided comprising a bracket 55 and an adjustment screw 56,0ne end'of which is adapted to bear against the upper portion of the main frame. 1

' The operation of this construction will be understood by reference more particularly to Figures 6 and 7. Figure 4 illustrates the position in which the danger zone of the machine is exposed and in the event of there being no opposition to movement of the second frame, rotation. of the operating shaft 16 will, by actuation of the push rod 49, cause the lever 45 tobe depressed audthe cam faced projection 46 to exertpressure upon the end 47 of the lever '38 thereby depressing it and causing the second frame to be rotated into the normal safe position, illustrated in Figure 6. In this'position the camfaced projection 46 is disengaged from the end 47 of the-lever 38. Should resistance to motion of the second frame be encountered (see Figure 7 such refsi'stancewill preclude the disengagement of the cam-faced'projection and further rotation of the shaft 16 will cause thrust to be transmitted through the link 40' to the main frame 4 thereby moving the latter away from the-body of the machine in opposition to the spring 52 and removing the obstruction from thedanger zone. 1 r i 5 v .The above description is furnished for the purpose of describing thenature of the invention and while certain constructions in ac- -cordance with the invention have been particularly described by way of example various-changes may be made in the constructional arrangements and details without exceeding the scope of the invention.

,- 'Having now described my inventiongvhat I claim as new and desire to secure by Letters Patentisz- 1. A.- guard for powerpresses and like machines comprising a mainframe pivotally connected withthe body of the machine, a

'cam member-fa pivotal connectionbetween said cam'memberanda stationary part of the machine, a push'rod bearing at one endagainst "the main frame and pivotally connected at its other end with the cam member, a lever coaxially 'mounted with the cam member, a

spring'connected at oneend with said lever,

and at its other end with a stationary part of the machine,a second lever pivotally connected with-one end of saidlever, a roller mounted on the other end of said secondmentioned lever co-operating with the face of the cam member, a rod connected at one end with said second mentioned lever, a pedal lever, a pivo- "tal connection between the other end of the said rodaand-the pedal lever adapted, upon actuation ofithevpedal lever, to rotate the said r-secondimentioned lever about its pivotal connection with the .first mentioned lever and cause "the roller bearing against the face of the raw 2 cam member to oscillate the cam and cause the push :rodrto move the main frame away from the body of themachine and towards the operator engaged in feeding the same, a second :frame pivotally connected with said main frame, a two armed lever connected with the second frame, alroller mounted on the end of said first mentioned lever remote from its pivotal connection with said second mentioned lever adapted when the main frame is 7 moving awayifrom thebody of the machine to co-operate with said two armed lever and move the second frame into a position in which it will preclude the hands of the operator entering the danger zone, a link pivotsuming the said position, to impart-to the imam frame further motion in an outward d1- rection and away from the machine thereby moving the second frame beyond the said position.

2. Aguard for power presses and like machinesihaving a working space constituting a danger zone for the operator engaged in feeding the same, comprising a main frame pivotally connected with the body of the machine, a cam member pivotally connected with a stationary part of the machine, a push rod hearing at one end against the main frame and pivotally connected at its other end with the cam member, a lever coaxially mounted with the cammember, a spring connected at one end with said lever, and at its other end with a stationary part ofthe machine, a sec ond lever pivotally connected with one end of the first mentioned lever, a roller mounted onthe other end of said second mentioned lever cosoperating with the'face of the cam member,ia rod connected at one end with said second mentioned =lever,;a pedal lever, a pivotal connection between the other end-of thesaid rod and the pedalrlever adapted, upon actuationiof'the pedallever to communicate .movement tocthe rod thereby rotating the said second mentioned lever about its pivotal connection with the first mentioned lever and causing the .rlollerbearing against the face of the cam member to oscillate thecam thus causingthe first mentioned'push rod to move the-main frame away :from the body of the t-machine and towards the operator, en-

gaged infeeding the'same, a second frame pivotally connected withthemain frame, a two armed lever connected with the second frame,a roller mounted on the end'of the first mentioned lever remote from. its pivotal connection'with the second mentioned lever adapted in moving .theqmain frame :away

from the body of the machine to co-operate with said two armed lever and move the second-frameinto a position inwhich it will preclude the hands of the operator'ientering the V danger zone, and linkmechanism connecting the said frames'with a moving part of the machine'adapted, in the event of-the second frame encountering opposition to assuming .the said position, to impart to the main frame further motionin an outward direction and away from the machine. I

3. Aguard for power presses and like machines having a working space constituting a danger .zone for the-operator engaged in 7' feeding the same, comprising a main frame, a second .frame pivotally connected with said main frame, movable elements interconnecting the second frame with a movingpart of the machine adapted in consequence of movement of the said moving part to communicate motion therefrom to the second frame thereby moving the same away from the body of v the .machine and towards the operator en gaged in feeding the same into a position in i-which it will preclude the hands of the operator entering the danger zone, a linkpivotally connected at one end with the main frame,

a recess adjacent to the other end of the link,

' a pin eccentrically mounted in'the opera-ting shaft of the machine adapted to engage within the recess, a rod'connected at one end through a lost motion connection with the,

link a lever connected with the second frame,

a plvotal connection between the other end of the said rod and the said lever adapted in the event of the' second frame encountering opposition to assumingthe said position, to communlcate to the main frame further motion n an outward, dlrectlon and away from.

the machine thereby moving the second frame beyond the said position.

4. A guard for power presses andlike-ma chines having a working space constituting a danger zone for the operator engaged 1n feeding the same,'compr1s1ng amam frame plv totally connected with the body of the machine, a. cam member pivotally connected with a stationary part of the machine, a push rod bearing at one end against the main frame and pivotally connected at its other end with the cam member, movable elements interconnecting the camimember with a moving part of the machine, adapted in consequence of movement of the said moving part to oscillatensaid cam member thereby causing the push rod to impart motion to the main frame from the body of the machine and towards the operator engaged in feeding the same, a second frame pivotally connected with the main frame, movable elements interconnecting the second frame with a stationary part of the machine adapted in consequence of the said motion of the main frame away from the body of the machine to move the second frameinto a position in which it will preclude the hands of the operator entering the danger zone, a link pivotally connected vat one end with the main frame, a

recess adjacent to the other end of the link, apin eccentrically mounted in the operating shaftof-tlie machine adapted to engage within the recess, a rod connected at one end through a lost motion connection with the link, a lever connected with the second frame,

the rod thereby rotating the s ti oned lever about its pivotal connection with the first mentioned" lever and causing the a pivotal connection between the other end of the said last mentioned rod and the said last mentioned lever adapted, in the event of thesecond frame encountering opposition to assuming the said position, to impart to the main frame further motion in an outward direction and away from the machine thereby moving the second frame beyond the said position.

' 5. A guard for powe presses and like machines having a working space constituting a I danger zone for the operator engaged'in' end with a stationary part of the machine, a

lesson d lever pivotally connected with one'end of lever, a roller mounted the other end of said second mentioned leverco-operating with the face of the "am membena rod 7 connected at one end with second mentioned lover, a pedal lever, pivotal connection between the other end of the said rod and the pedal lever adapted upon actuation of the pedal lever to communicate movement to.

d second menroller bearing against the face of the cam member to oscillate the cam thus causing the 1 away from the body of thema'chine and towards the operator engaged in feeding the same, a second frame pivotally connected with the main frame, movable elements interconnecting the second frame with a stationary part of the machine adapted in consequence of the said motion'of the main frame away from the body of the machine to move the a second frame into a position in which it will preclude the hands of the operator entering the danger zone, a link pivotally connected at one end with the mainframe, a recess adjacent to the other end of the link, a pin eccentrically mounted in the operating shaft of the machine engaging within the recess, arod connected at one end through a lost motion connection with he link, a'lever connected with the second frame, a pivotal connection between the other end of the last mentioned rod and the said last men ioned lever adapted in the event of the second frame encountering opposition to assuming the said position, to impart to the main frame further motion in an outward direction and away from the machine thereby moving the second frame beyond the said position. i

w 6. A guard for power presses and like ma- 7 chines navinga working space constituting a danger zone for-the operator engaged in feeding the-same, comprising a main frame pivotally connected with a stationary part of the ma hine, a lever pivotally connected at one end ith a stationary part of the machine and at its other nd'with a moving part of the machine, second frame pivotally connected with the main frame, a' secondlever pivotally connected at one end with the second frame, a lin pivotally connected at one end with the said-second'lever and provided at its other end with an elongated slot, a stop on the first mentioned lever co-operating with the elongated slot, a cam faced member associated with the operation to co-operate withthe' end of the second mentioned lever remote from the second frame in order to move the second frame outward away I from the body of the machine and towards the operator] engaged in feeding t e same into a position in which it will preclude thehands of the operator from enter ng the danger zone, a second link pivotally connected at one end coaxially with s d first mentioned link and at its'other end with the main frame adapted in the event of the second frame encountering opposition to assuming the said position to cause the driving connection between the cam faced member and the end of the second mentioned leverto be continued and positive motionto be imparted to the said frames whereby the second frame is moved an outward direction beyond the said position. r

7. A guard for power presses-and like'ma first mentioned lever adapted in setting the machine into push rodto impart motionto the main frame 7 chines having a working space constituting a danger zone for the operator engaged in feeding the same, comprlsing a guard member,

movable elements interconnecting the guard member with a moving part of the machine adapted in consequence of movement of the said moving part to communicate motion therefrom to the guard member thereby moving the same outward away from the body of the machine into a position in which it will preclude the hands of the operator entering the danger zone, and further movable elements interconnecting the guard member with a moving part of the machine adapted in the event of the guard member encountering opposition to assuming the said position to communicate further motion thereto from the machine and to move it positively in an outward direction beyond the said position.

8. A guard for power presses and like machines having a working space constituting a danger zone for the operator engaged in feeding the same, comprising a main frame, a second frame associated with the main frame, movable elements interconnecting the second frame with a moving part of the machine adapted in consequence of movement of the said moving part to communicate motion therefrom to the second frame thereby moving the same away from the body of the machine and towards the operator engaged in feeding the same into a position in which it will preclude the hands of the operator entering the danger Zone, and further movable elements interconnecting the said frames with a movable part of the machine adapted in the event of the second frame encountering opposition to assuming the said position, to communicate from the machine to the said frames motion inan outward direction beyond the said position.

9. A guard for power presses and like machines having a working space constituting a danger zone for the operator engaged in feeding the same, comprising a main frame pivotally connected with the body of the machine, movable elements interconnecting the said main frame with a moving part of the machine and adapted in consequence of movement of the said moving partto communicate motion therefrom to the main frame thereby moving the same away from the body of the machine and towards the operator engaged in feeding the same, a second frame pivotally connected to the main frame, further movable elements interconnecting the second frame with a stationary part of the machine adapted in consequence of the said movement of the main frame to cause the second frame to move into a position in which it will preclude the hands of the operator entering the danger zone and further movable elements interconnecting the frames with a moving part of the machine adapted in the event of the second frame encountering resistance to its; motion to movethe said frame positively, in, an. outward direction beyond the saidposition. v 10. A, guard forpower presses and like machines having a working space constitutr ing a danger zone; for the operator engaged in feeding the: same, comprising a main framepivotally ccimectedwith the body of the machine, movable elements interconnecting the main frame with a moving part of the machine adapted in consequence. of"

movement of'the said moving part to communicate motion therefrom to the main frame thereby moving the same away from the'body of the machine towards the operator engaged in feeding the same, a second frame pivotally connected with the main frame, further movable elements interconnecting the second frame with a stationary part of the machine and adapted in consequence of the said motion of the main frame to move the second frame into a positionin which it will preclude the hands of the operator entering the danger zone, a further movable element connected with the main frame and releasably connected with a moving part of the machine, and a rod interconnecting the said movable element with the second frame adapted to cause the movable element to be released from engagement with the said moving part in the event of the second frame reaching the said position and in the event of the second frame encountering resistance to its motion to cause the movable element to continue in engagement with the said moving partthereby communicating positive motion to the frames in an outward direction beyond the said position.

11. A guard for power presses and like machines having a working space constituting a danger zone for'the operator engaged in feeding the same, comprising a main frame pivotally connected with the body of the machine, acam member pivotally connected with a stationary part of the machine, a push rod bearing at one end against the main frame and pivotally connected at its other end with the cam member, movable elements interconnecting the cam member with a moving part of the machine and adapted in consequence of movement of the said-moving part to oscillate the said cam member thereby causing the push rod to move the main frame away from the body of the machine and towards the operator engaged in feeding the same, a second frame pivotally connected with the main frame, movable elements interconnecting the second frame with a stationary part of the machine and adapted in consequence of the said motion of the main frame away from the body of the machine to move the second frame into a position in which it will preclude the hands of the operator entering the danger zone and further movable elements interconnecting the frames with a moving part of the machine adapted in the event of the second frame encountering opposition to assuming the said position to communicate from the said moving part to the main frame further motion in an outward direction away from the machine thereby moving the second frame positively beyond the said position.

In testimony whereof I have signed my name to this specification.

WILLIAM JESSO P. 

